Chakravorty, Akshoy Kumar (1993) Intermediate Si-Al spinel phase-formation in phase-transformation of diphasic mullite gel. Journal of Materials Science, 28 (14). pp. 3839-3844. ISSN 0022-2461

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Al2O3-SiO2 diphasic mullite gel (Si/Al = 1/3) has been synthesized by using Al(NO3)3.9H2O and Ludox in basic conditions. Its phase transformation behaviour has been studied by qualitative and quantitative X-ray diffraction techniques. The results indicate that a noncrystalline alumino-silicate phase forms together with the slow crystallization of Si-Al spinel phase of a mullite-like composition up to 1250-degrees-C. Thereafter, it transforms suddenly to orthorhombic mullite around 1325-degrees-C. Earlier studies, e.g. alkali leaching, and measurement of co-ordination number of aluminium in 1000-degrees-C heated diphasic gel, confirm Si-Al spinel formation as an intermediary phase.

Item Type: Article
Subjects: Engineering Materials
Depositing User: Bidhan Chaudhuri
Date Deposited: 20 Aug 2013 08:21
Last Modified: 20 Mar 2016 15:07

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